Is CVE-2021-4147 in the CISA KEV catalog?

No. CVE-2021-4147 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4147?

CVE-2021-4147 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-4147?

CVE-2021-4147 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4147?

Upgrade libvirt on debian 11 to 7.0.0-3+deb11u3 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4147

MEDIUM

6.5

CVSS v3

NVD

Description

A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.

CWE-667

How to fix

Remediation Available

libvirtDebian

Fixed in:7.0.0-3+deb11u3CVE-2021-4147

Fixed in:7.10.0-2CVE-2021-4147

libvirtUbuntu

Fixed in:4.0.0-1ubuntu8.21USN-5399-1

Fixed in:6.0.0-0ubuntu8.16USN-5399-1

libvirt-daemonUbuntu

Fixed in:4.0.0-1ubuntu8.21USN-5399-1

Fixed in:6.0.0-0ubuntu8.16USN-5399-1

libvirt-daemon-systemUbuntu

Fixed in:4.0.0-1ubuntu8.21USN-5399-1

Fixed in:6.0.0-0ubuntu8.16USN-5399-1

libvirt0Ubuntu

Fixed in:4.0.0-1ubuntu8.21USN-5399-1

Fixed in:6.0.0-0ubuntu8.16USN-5399-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory1

security.netapp.com

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-667 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-10072	High	7.5	73%	-	Fix
CVE-2002-1850	High	7.5	17%	-	Fix
CVE-2009-2699	High	7.5	14%	-	Fix
CVE-2004-0174	High	7.5	12%	-	-
CVE-2009-4272	High	7.5	11%	-	-
CVE-2020-24606	High	8.6	5.2%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.